The 10 Commandments of Hair Accessories

Once associated with proms and pageants, embellished barrettes and headbands are now getting grown-up attention.

TRY A HIGH, TIGHT, TOTALLY BADASS PONYTAIL

A piece of black plastic and tons of shine serum give a high ponytail a naughty (and cool) dominatrix vibe. At Jason Wu, Gilbert flatironed the hair and slicked on Kérastase Resistance Fibre Architecte before wrapping black bondage tape from a Paris sex shop around high ponytails. "You want the hair stick-straight and supported away from the head," she says. "That swingy, swishy movement is so sexy."